1. Christopher Columbus was the first explorer _________ discovered America in 1492.
A. which
B. whose 
C. who
D. whom
2. Lan: "Your cooking is very good. I have never had such a delicious meal before."
Hoa: "__________"
A. Yes, I think so
B. Let me congratulate you on it
C. Well done
D. That's very kind of you
3. I _______  from her for a long time.
A. didn't hear
B. am not hearing
C. haven't heard
D. don't hear
Giải thích giúp e với ạ

     \(\frac{3+x}{2}\)=\(\frac{x}{4}\) các bạn giúp mình với

Rewrite the following sentences
1.John began eating pizza when he was a little boy
->……………………………………
2.They started taking part in VEO two years ago
……………………………………………………
3.He started working in that bank last Christmas
………………………………………………………
4.We started living here fifteen years ago
………………………………………………………
5.Minh began to collect stamps in 2000
……………………………………………………..
6.Hoa and Mary have gone to Paris since 2015
………………………………………………………
7. I have studied English for three years
………………………………………………………
8. We have left school since we were 17
………………………………………………………
9. My father has worked in this company for 3 years
………………………………………………………
10. She has made a cake for two hours
………………………………………………………

Câu 4: Hai thửa ruộng thu hoạch được 2526 ki-lô-gam thóc. Thửa ruộng thứ hai thu hoạch được hơn thửa ruộng thứ nhất 386 ki-lô-gam thóc. Hỏi mỗi thửa ruộng thu hoạch được bao nhiêu ki-lô-gam thóc?